BENSON — Three members of a Benson family were killed and another was injured when a dump truck hit their pickup truck head-on Wednesday morning in Missouri, police said.

Terry Schroeder, 50, Cindy Schroeder, 46, and Dylan Schroeder, 14, were pronounced dead at the scene at 9:03 a.m. Wednesday by Camden County Medical Examiner Angela Halterman, while 14-year-old Donny Schroeder was taken to University Hospital in Columbia with serious injuries, according to a report from the Missouri State Highway Patrol. The dump truck driver, Randal D. Estes, 56, of Warsaw, Mo., was also pronounced dead at the scene.

The dump truck was northbound on North Missouri Highway 5 on the Niangua Bridge about 7:40 a.m. Wednesday when its left front tire went flat. Estes lost control of the dump truck and crossed into the southbound lane, striking the Schroeders’ 2012 Ford F250 pickup truck head on, according to the report. The Schroeders pickup was pulling a boat on a trailer, which struck the rear of the pickup after the collision, police said.

Terry Schroeder, Dylan Schroeder and Donny Schroeder were wearing seatbelts, according to the report, while Cindy Schroeder and Estes were not.

Note: This story was updated on July 26 to correct the spelling of the name of Donny Schroeder.